I guess it will always come down to what one decides to believe or not believe. NASA and NOAA have no reason to "manufacture data" toward some nefarious end unless one believes it's all part of a larger conspiracy backed by the US gov.
http://climate.nasa.gov/evidence/
BTW, those same whistle blowers back in the '80s reported out on Ozone depletion over the Antarctic. The result was a global mandate under the 1987 Montreal protocol to stop using ozone-depleting substances such as those found in spray cans and refrigerators - which were banned all over the world effective 1989. Similar to Global Warming/Climate Change, different man-made byproducts, same urgency to resolve.